Table 1.

The relative risk of the 5 risk factors of osteoporotic hip fractures for men and women, the definition and level of each factor has been indicated

Risk factor	Definition categorization	Age group	(CI) Relative risk for women [reference]	(CI) Relative risk for men [reference]
Low Ca and Vit D intake	Less than 1000mg Ca and less than 800u vit D	≥50	(1.03-1.25)	(1.03-1.25)
			1.14[22]	1.14[22]
Low serum Vit D	Serum level less than 62,5nmol/lit	≥65	(1.12-2.17)	(1.12-2.17)
			1.56[23]	1.56[23]
Smoking	Current smokers	≥55	(1.12-1.65)	(1.04-2.43)
			1.36[24]	1.59[24]
Low physical activity or inactivity	No activity or activity less than 1 hour of walking per week	≥50	(1.06-2.70)	(1.06-2.70)
			1.70[25]	1.70[25]
Low BMI	BMI less than 20 in comparison to normal BMI[26–31]	≥50	(1.23-3.28)	(1.23-3.28)
			1.79[32]	1.79[32]